seo script example (as used on foxy)

getAffiliate.js

// @flow

import store from '../store';
import getCookie from './Cookie/get';

export default () => {
  const { isLoggedIn, profile } = store.get('player').getState();
  if (isLoggedIn) {
    if (!profile || (!profile.id && !profile.tag)) {
      return null;
    }

    if (profile.tag) {
      return profile.tag;
    }

    return profile.id;
  }

  const cookieValue = getCookie('AffiliateID');
  if (cookieValue) {
    return cookieValue;
  }

  const seoValue = getCookie('AffiliateID2');
  if (seoValue) {
    return seoValue;
  }

  return null;
}

seo-script.js

(function(require) {
	/**
     *
     *	So since the whole SEO affiliate setup has become somewhat convoluted, we'll run with this behaviour:
     *	We'll store 2 AffiliateIds.
     *	
     *	AffiliateId1
     *	 - conventional affiliate id.
     *	 - populated from ?a=
     *	 - lasts 30 days
     *	 - is overridden by subsequent affiliate ids. (Spoke a while back to Active Wins and this is their normal and preferred behaviour)
     *	
     *	AffiliateId2
     *	 - assigned based on referrer (essentially an SEO affiliate id)
     *	 - persists for the users session (so until they close the browser)
     *	
     *	When passing the user to either the mobile app or the reg form we will send them with affiliate id 1 if it exists, then if not we'll pass it with affiliate id 2.
     *
     */
    var setCookie = require('app/utils/Cookie/set')['default'];
    var affiliateId = null;
    var referrer = self.document.referrer;
    try {
    referrer = self.parent && self.parent.document && self.parent.document.referrer
    	|| self.document.referrer;
    } catch (e) { }

    /**
     Rules
     **/
    if (referrer.match(/google\./)) {
        affiliateId = '2748.26';
    }

    if (referrer.match(/altavista\.|aol\.|ask\.|bing\.com|msn\.|search\.|yahoo\.|yandex\.ru/)) {
        affiliateId = 2748.25;
    }
	/**
     End of Rules
     **/

    if (!affiliateId) {
		return;
    }

	setCookie('AffiliateID2', affiliateId, 'session', '/');

})(require);